W DOC AIRBUS | AMM A320F

Repair by Replacement of the Acoustic Linings - VRS1845 [IAE]

TASK 72-32-85-300-020-A
Repair by Replacement of the Acoustic Linings - VRS1845

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION: YOU MUST KEEP ALL SURFACES CLEAN DURING THIS REPAIR. DIRT OR GREASE ON BONDING SURFACES WILL CAUSE UNSATISFACTORY BONDS. CLEAN COTTON OR POLYTHENE GLOVES MUST BE WORN BY ALL PERSONS TOUCHING THE PARTS TO BE BONDED. THE TOUCHING OF PARTS MUST BE KEPT TO A MINIMUM AND COMPONENTS MUST NOT BE TOUCHED ON THEIR PREPARED SURFACES.
CAUTION: TO GET GOOD BONDING, YOU MUST TAKE CARE TO CORRECTLY PREPARE THE ABRADED SURFACES AND TO USE THE ADHESIVE CORRECTLY.
NOTE: This repair procedure is estimated to take less than 15 hours in the hangar when done by skilled mechanics familiarized with this procedure.
ZONE: 410
ZONE: 420
FIN: 1000EM1 ** ON A/C NOT FOR ALL
FIN: 1000EM2 ** ON A/C NOT FOR ALL
1. Reason for the Job
Self explanatory
2. Job Set-up Information
 A. Fixtures, Tools, Test and Support Equipment
REFERENCE
QTY
DESIGNATION
No specific
AR
ACCESS PLATFORM 1M(3 FT)
No specific
AR
BLASTING EQUIPMENT - SAND, PORTABLE
No specific
AR
BRUSH - BRISTLED
No specific
AR
DETECTOR - HELITEST WING KIT DET-W-40052
No specific
AR
GUN - SEALANT
No specific
AR
HAMMER - AIR
No specific
AR
KNIFE - PUTTY
No specific
AR
MACHINE - AIR GRINDER
No specific
AR
MACHINE - FLUX CHIPPER
No specific
AR
MAT - WORK
No specific
AR
PUMP - VACUUM
No specific
AR
SCRAPER
No specific
AR
THICKNESS MEASURING EQUIPMENT - ULTRASONIC
No specific
AR
VACUUM CLEANER
No specific
AR
VACUUM SANDBLASTER
No specific
AR
VALVE - VACUUM
No specific
AR
WARNING NOTICE(S)
IAE3J13053
1
FIXTURE-BONDING
IAE3J13055
1
FIXTURE-BONDING
 B. Consumable Materials
REFERENCE
DESIGNATION
(Material No.V01-031)
Acetone, Technical grade
(Material No.V01-060)
Acetone, Analar grade
(Material No.V01-124)
Isopropyl Alcohol, Technical grade
(Material No.V02-005)
adhesive tape
(Material No.V02-097)
lint free gloves
(Material No.V02-099)
lint free cloth
(Material No.V02-100)
white nylon gloves
(Material No.V02-166)
breather cloth
(Material No.V02-222)
bagging film
(Material No.V02-223)
release film
(Material No.V02-224)
silicone adhesive polyester tape
(Material No.V02-334)
porous release film
(Material No.V05-003)
abrasive medium
(Material No.V05-016)
garnet paper
(Material No.V05-020)
waterproof silicon carbide
(Material No.V05-185)
polishing discs
(Material No.V05-186)
conditioning disc
(Material No.V08-006)
filler, two pack
(Material No.V08-024)
sealant
(Material No.V08-154A)
sealant
(Material No.V08-155)
adhesive promoter
(Material No.V12-045)
vacuum bag sealant tape
(Material No.V12-046)
vacuum bag sealant tape
No specific
polyethylene sheet
 C. Work Zones and Access Panels
ZONE/ACCESS
ZONE DESCRIPTION
410
ENG 1 PYLON BOX AND FORWARD FAIRING
420
ENG 2 PYLON BOX AND FORWARD FAIRING
 D. Referenced Information
REFERENCE
DESIGNATION
TASK 70-30-00-918-010-A
Consumable Materials Index
TASK 72-31-00-000-010-B
Removal of the LP Compressor (Fan) Module
TASK 72-31-00-400-010-B
Installation of the LP Compressor (Fan) Module
TASK 72-31-11-000-010-B
Removal of the LP Compressor Fan Blades
TASK 72-31-11-400-010-C
Installation of the LP Compressor Fan Blades
TASK 72-32-85-350-015-A
Repair of the Fan Case - VRS1824 - PRE SBE 72-0160
TASK 72-32-88-000-010-B
Removal of the Fan Exit Guide Vanes (FEGVs)
TASK 72-32-88-400-010-B
Installation of the Fan Exit Guide Vanes (FEGVs)
F Repair of the Acoustic Linings
F Repair of the Acoustic Linings
F Aluminum Chisel for Air Hammers or Flux Chippers
F Vacuum Bag
F Curing Chart of the Adhesive (V08-021)
F Curing Chart of Filling Material (V08-006)
3. Job Set-up
Subtask 72-32-85-941-139-A ** ON A/C NOT FOR ALL
A. Safety Precautions
   (1) On the center pedestal, on the ENG panel 115VU:
     (a) Put a WARNING NOTICE(S) to tell persons not to start the engine.
   (2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
   (3) On the overhead maintenance panel 50VU:
     (a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
     (b) Put a WARNING NOTICE(S) to tell persons not to energize the FADEC 1(2).
Subtask 72-32-85-010-076-A ** ON A/C NOT FOR ALL
B. Get Access
   (1) Remove a sufficient number of LP compressor blades and fillers to get access to the repair area (Ref. AMM TASK 72-31-00-000-010) or (Ref. AMM TASK 72-31-11-000-010).
   (2) Remove a sufficient number of Fan Exit Guide Vanes (FEGVs) to get access to the repair area (Ref. AMM TASK 72-32-88-000-010).
Subtask 72-32-85-941-083-A ** ON A/C NOT FOR ALL
C. Put the Ground Support Equipment into Position
   (1) Put the ACCESS PLATFORM 1M(3 FT) into position to give access to the engine.
   (2) Put the MAT - WORK into position in the fan case.
NOTE: Make sure that the red warning pennants of the workmat can be seen externally.
NOTE: Make sure that the workmat has sufficient dimensions to give full protection to the lower half of the fan case.
4. Procedure
Subtask 72-32-85-350-090-A ** ON A/C NOT FOR ALL
A. Prepare Areas of Aamaged Area
   (1) Use adhesive tape (Material No.V02-005) and polyethylene sheet or equivalent to protect the engine opening.
NOTE: Make sure that the masking sheet has sufficient dimensions to give full protection to the inlet of the LPC guide vane assembly, outlet of the stage 2.5 bleed duct and inside of the LP stub shaft.
Subtask 72-32-85-340-098-A ** ON A/C NOT FOR ALL
WARNING: DO NOT OPERATE WITHOUT SAFETY GOGGLES AND OTHER GUARD EQUIPMENT. FLYING PARTICLES CAN CAUSE INJURY.
CAUTION: SILICON CARBIDE TYPE WHEELS, STONES AND ABRASIVE PAPERS ARE TO BE USED FOR THIS REPAIR. ALUMINUM OXIDE TYPES MUST NOT BE USED.
CAUTION: THE MATERIAL WILL OXIDIZE AND CRACK IF MECHANICAL CUTTERS ARE USED HEAVILY. THIS HAS OCCURRED IF THE COMPONENT SHOWS DARK STRAW TO BLUE DISCOLORATION. IF AT ANY TIME THIS COLORATION OCCURS THE CASES MUST BE REJECTED
CAUTION: DO NOT USE POWERED TOOLS WITH STEEL CHISEL OR SIMILAR BITS.
CAUTION: THE FAN CASE IS MADE FROM TITANIUM ALLOY AND IS THIN IN SOME AREAS. IF YOU HIT THE FAN CASE WITH A CHISEL OR SCRAPER YOU CAN MAKE IT UNSERVICEABLE.
CAUTION: YOU MUST USE THE CHISEL, SHARP BLADE OR SCRAPER IN A CIRCUMFERENTIAL DIRECTION TO PREVENT THE EDGES OF THE BLADE SCORING THE FAN CASE.
CAUTION: YOU MUST ALWAYS TRY TO POINT THE CHISEL OR SHARP BLADE PARALLEL WITH THE SURFACE OF THE FAN CASE.
CAUTION: HAND DRESSING TOOLS ARE NOT TO BE USED AT THE SAME LOCATION, DO NOT DWELL IN ONE AREA OR ANY AREA.
CAUTION: PREVENT TOO MUCH SURFACE ABRASION OF THE FAN CASE MATERIAL. SURFACE FINISH USING ABRASIVE BLASTING IS NECESSARY. THIS WILL GIVE THE BEST BONDING RESULTS.
B. Prepare the Repair Area
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
   (1) Remove most of the damaged linings. Use HAMMER - AIR or MACHINE - FLUX CHIPPER with aluminum chisel.
F Aluminum Chisel for Air Hammers or Flux Chippers ** ON A/C NOT FOR ALL
   (2) Remove all the remaining unwanted material and adhesive from the case with MACHINE - AIR GRINDER and polishing discs (Material No.V05-185) or conditioning disc (Material No.V05-186)
   (3) Remove all remaining unwanted material with the VACUUM CLEANER.
   (4) Make sure that the replacement linings can be placed in position.
   (5) Cleaning of the repair area.
WARNING: A PRESSURIZED AIR STREAM CAN CAUSE INJURY. WEAR SAFETY GOGGLES AND PROTECTIVE CLOTHING.
CAUTION: USE THE VACUUM SANDBLASTER FOR THE BEST BONDING SURFACE OF THE TITANIUM PARTS.
CAUTION: YOU MUST USE OIL-FREE DRY AIR ONLY.
     (a) Remove all grease from the repair area with V01-031Acetone, Technical grade, V01-060Acetone, Analar grade, or V01-124Isopropyl Alcohol, Technical grade and a BRUSH - BRISTLED (Ref. AMM TASK 70-30-00-918-010).
NOTE: Examine the bonding area of the fan case assembly for the surface finish and for any nicks, dents, scratches and gouges. The wall thickness can be measured with the THICKNESS MEASURING EQUIPMENT - ULTRASONIC or equivalent, if necessary. If necessary do blend repair (Ref. AMM TASK 72-32-85-350-015).
     (b) Fully mask off all areas except bonding area with silicone adhesive polyester tape (Material No.V02-224) and/or other applicable procedure.
     (c) Make the repair area rough with dry abrasive blast with abrasive medium (Material No.V05-003) and VACUUM SANDBLASTER or BLASTING EQUIPMENT - SAND, PORTABLE.
NOTE: Remove the glossy surface from the repair area of the fan case assembly. Make sure that there is a constant matt surface on the repair area.
NOTE: IAE recommends that the working pressure of the vacuum sandblaster or portable sandblaster is approximately 70 psi to 100 psi (480 KPa to 690 KPa).
NOTE: IAE recommends that the minimum time of operation for a blasting of repair area is 40 minutes for each lining area.
     (d) Remove all remaining unwanted material with the vacuum cleaner.
     (e) Immediately dry the area with the oil free dry air blast.
NOTE: Continue with the bonding process in less than 8 hours after the cleaning procedure.
Subtask 72-32-85-210-087-A ** ON A/C NOT FOR ALL
C. Do a Water-break Inspection of the Repair Area
CAUTION: DO NOT TOUCH THE PREPARED SURFACE, BETWEEN THE PROCEDURE TO CLEAN AND THE BONDING PROCEDURE.
CAUTION: DO NOT USE TAP WATER AND MINERAL WATER. YOU MUST USE DISTILLED OR DEIONIZED WATER DURING THE WATER-BREAK INSPECTION.
   (1) Clean the bonding surface with V01-031Acetone, Technical grade, V01-060Acetone, Analar grade, or V01-124Isopropyl Alcohol, Technical grade.
   (2) Use a clean soft BRUSH - BRISTLED to quickly apply a layer of clean distilled or de-ionized water to the bonding surface.
   (3) Immediately look to see if the layer has a break in continuity.
   (4) If a break in continuity occurs in less than 30 seconds, clean the surface again until a continuous layer is seen.
   (5) Remove the water with clean V01-031Acetone, Technical grade or V01-060Acetone, Analar grade, then let the surface dry.
NOTE: Continue with the bonding process in less than 8 hours after the water break check.
Subtask 72-32-85-340-222-A ** ON A/C NOT FOR ALL
D. Apply Adhesion Promoter
   (1) Surface preparation.
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
     (a) Remove all grease from the repair area with V01-031Acetone, Technical grade, V01-060Acetone, Analar grade or V01-124Isopropyl Alcohol, Technical grade and lint free cloth (Material No.V02-099) .
NOTE: Always pour cleaning fluid on the cloth to avoid contaminating the cleaning fluid supply. Wash one small area at a time.
NOTE: It is important that the surface is dried with a second clean cloth prior to the cleaning fluid evaporating to prevent the redeposition of contaminants on the fan case surface.
   (2) Apply a thin coat of adhesive promoter (Material No.V08-155) to the cleaned surface by brush or clean gauze and allow to dry for approximately 30 minutes at room temperature.
NOTE: If primed surface contaminated or bonding is not accomplished within 8 hours after application of the adhesion promoter, repeat priming procedure.
Subtask 72-32-85-340-099-A ** ON A/C NOT FOR ALL
E. Bond the New Linings
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
CAUTION: DO NOT USE PR2001B-1/2 SEALANT. THIS MATERIAL IS 30 MINUTES APPLICATION LIFE TYPE SEALANT. THIS BONDING STEP IS ESTIMATED TO TAKE MORE THAN 1 HOUR WHEN DONE BY SKILLED MECHANICS FAMILIARIZED WITH THIS APPLICATION PROCEDURE.
   (1) Make the bonding surfaces on the replacement linings rough with garnet paper (Material No.V05-016) .
   (2) Remove all remaining unwanted material with a VACUUM CLEANER.
   (3) Use the sealant (Material No.V08-154A) . Weigh out 100 parts of base compound (white compound) and 18,5 parts of curing compound (black compound). If using SEMKIT form sealant, prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
NOTE: This sealant is supplied in several forms. The preferred form is SEMKIT, alternative is the tin form.
NOTE: Wear lint free gloves (Material No.V02-097) or white nylon gloves (Material No.V02-100) when you touch the parts.
   (4) Mix the two parts together until the paste is a constant color. No streaks are permitted.
NOTE: The life of the mixed sealant is approximately 2 hours at 77 deg.F (25.00 deg.C) .
NOTE: Application life is dependent upon ambient environmental conditions. Increases in temperature and low humidity will shorten application time. Conversely, lower temperatures and high humidity will increase application life. For the examples, the life of the mixed sealant is approximately 2 hours at 77 deg.F (25.00 deg.C) and 50 percent RH.
   (5) Use a KNIFE - PUTTY or GUN - SEALANT to apply the sealant to mating surfaces of both components to a thickness of between 0.079 and 0.118 in. (2.0 and 3.0 mm). Where drain channel are to be fitted apply sealant at a thickness of 0.004 to 0.010 in. (0.10 mm to 0.25 mm). Be careful not to touch prepared surface.
NOTE: In order to ensure that acoustic lining honeycomb has contact with the surface of the sealant it is necessary to apply the sealant to the maximum specified thickness 0.118 in. (3.0 mm). The sealant layer thickness must not fall below the specified minimum 0.079 in. (2.0 mm).
NOTE: For the best results apply a thin layer of the sealant for filled honeycomb area but satisfactory results can be achieved with layers as much as 0.02 in. (0.5 mm) thick.
NOTE: If it is necessary, remove the sealant to around the linings. This step is dispense with "apply the V08-006filler, two pack to the gaps".
   (6) Put the replacement linings into position and hold them with silicone adhesive polyester tape (Material No.V02-224) .
NOTE: Move the new linings into position with the shim plates (locally made) between the linings, if necessary.
NOTE: Make sure there are no interference and/or too much gap (less than 0.078 in. (2.0 mm)) between the FEGV and rear edge of the linings.
   (7) Put the replacement linings into position and hold them with silicone adhesive polyester tape (Material No.V02-224) .
Subtask 72-32-85-340-100-A ** ON A/C NOT FOR ALL
F. Method 1: Hold the New Linings in Position with the Vacuum Bag
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Vacuum Bag ** ON A/C NOT FOR ALL
NOTE: This Method 1 is an alternative to Method 2.
   (1) Make up the annular vacuum bag:
     (a) Cover the replacement linings with a sheet of porous release film (Material No.V02-334) that is 3.00 in. (76,2 mm) longer than each end of the linings, 3 plies of breather cloth (Material No.V02-166) and one ply of release film (Material No.V02-223) .
     (b) Over them apply a bagging film (Material No.V02-222) to the anti-ice impact panels and the metal surface of the fan case.
     (c) Install the VALVE - VACUUM to the bagging film.
     (d) Seal the edges of the bagging film to the anti-ice impact panels and the metal surface of the fan case with vacuum bag sealant tape (Material No.V12-045) or vacuum bag sealant tape (Material No.V12-046) .
     (e) Remove the air from the vacuum bag with the PUMP - VACUUM. Do a check for leaks with your ears or with an DETECTOR - HELITEST WING KIT DET-W-40052.
     (f) Apply and keep a vacuum of 10.2 psi (70 kpa). This must be kept during the cure time.
     (g) Cure the sealant.
       1 Allow the sealant (Material No.V08-154A) to cure for 9 hours at ambient temperature 77 deg.F (25.00 deg.C) to 95 deg.F (35.00 deg.C).
       2 Cure may be hastened by applying heat. The sealant (Material No.V08-154A) can obtain a serviceable cure hardness after four hours at 113 deg.F (45.00 deg.C).
       3 If the remaining sealant after repair exceeds the limit, dress the selant material with waterproof silicon carbide (Material No.V05-020) , if necessary.
NOTE: Make sure that you monitor the ambient temperature of the sealant and work area with suitable instruments, across all of the lining.
NOTE: Make sure the full cure time is used and correct temperature maintained.
NOTE: If the bonding process passes 48 hours though is a condition of any humidity if the curing temperature is secured 50 deg.F (10.00 deg.C) or more, necessary strength is secured.
     (h) Remove the vacuum bag and the sealant tape.
Subtask 72-32-85-340-201-A ** ON A/C NOT FOR ALL
G. Method 2: Hold the New Linings in Position with the IAE3J13053 FIXTURE-BONDING and IAE3J13055 FIXTURE-BONDING.
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Curing Chart of the Adhesive (V08-021) ** ON A/C NOT FOR ALL
NOTE: This Method 2 is an alternative to Method 1.
   (1) Install the IAE3J13053 FIXTURE-BONDING and IAE3J13055 FIXTURE-BONDING to hold the new linings in position.
   (2) Cure the sealant.
CAUTION: THE MAXIMUM TEMPRERATURE WHICH CAN BE USED TO CURE THE FILLER IS 140 DEG.F (60 DEG.C).
     (a) Allow the sealant (Material No.V08-154A) to cure for 9 hours at ambient temperature 77 deg.F (25.00 deg.C) to 95 deg.F (35.00 deg.C).
     (b) Cure may be hastened by applying heat. The sealant (Material No.V08-154A) can obtain a serviceable cure hardness after four hours at 113 deg.F (45.00 deg.C).
     (c) If the remaining sealant material after repair exceeds the limit, dress the sealant material with waterproof silicon carbide (Material No.V05-020) , if necessary.
NOTE: Make sure that you monitor the ambient temperature of the sealant and work area with suitable instruments, across all of the lining.
NOTE: Make sure the full cure time is used and correct temperature maintained.
NOTE: If the bonding process passes 48 hours though is a condition of any humidity if the curing temperature is secured 50 deg.F (10.00 deg.C) or more, necessary strength is secured.
   (3) Remove the IAE3J13053 FIXTURE-BONDING and IAE3J13055 FIXTURE-BONDING.
Subtask 72-32-85-340-101-A ** ON A/C NOT FOR ALL
H. Prepare the Filler Material
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
   (1) Use V08-006filler, two pack. Measure 100 parts of blue paste (part B) and 94 parts of white paste (part A).
   (2) Mix the two parts together until the paste is a constant blue colour. No streaks are permitted.
NOTE: The minimum cure time is one hour at 140 deg.F (60 deg.C).
NOTE: When mixed the life of the filler is approximately one hour at 72 deg.F (22 deg.C).
Subtask 72-32-85-340-102-A ** ON A/C NOT FOR ALL
I. Apply the Filler Material
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
   (1) Use the GUN - SEALANT to put the filler into the gaps around the replacement linings to slightly more than the necessary level.
   (2) When the filler starts to feel hard, remove all unwanted filler.
   (3) Use the KNIFE - PUTTY or a SCRAPER to get a burnished effect.
   (4) If necessary, to get a smooth finish apply a small quantity of cold water to the putty knife to make it moist.
NOTE: Do not use too much water because it will cause the filler to plasticize.
   (5) Curing of the filler.
CAUTION: THE MAXIMUM TEMPRERATURE WHICH CAN BE USED TO CURE THE FILLER IS 140 DEG.F (60 DEG.C).
     (a) Cure the filler. The cure time given in figure "Curing Chart of Filling Material", is determined by the selected temperature.
F Curing Chart of Filling Material (V08-006) ** ON A/C NOT FOR ALL
NOTE: The minimum cure time is one hour at 140 deg.F (60 deg.C).
NOTE: The filler will not cure at a temperature of less than 54 deg.F (12 deg.C).
NOTE: Make sure the full cure time is used, and correct temperature maintained.
   (6) Blend the filler to the contour with garnet paper (Material No.V05-016) , if necessary.
   (7) Remove all unwanted material with the VACUUM CLEANER.
Subtask 72-32-85-340-103-A ** ON A/C NOT FOR ALL
J. If Necessary, Fill the Slots Between the Acoustic Linings
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.
   (1) Prepare the sealant material. Method 1: Prepare the sealant (Material No.V08-154A) .
     (a) Use the sealant (Material No.V08-154A) . Weigh out 100 parts of base compound (white compound) and 18.5 parts of curing compound (black compound). If using SEMKIT form sealant, prepare either by hand, or using a mixing machine as described in the manufacturer's leaflet.
NOTE: This sealant is supplied in several forms. The preferred form is SEMKIT, alternative is the tin form.
     (b) Mix the two parts together until the paste has a constant color. No streaks are permitted.
NOTE: The life of the mixed sealant is approximately 2 hours at 77 deg.F (25.00 deg.C).
NOTE: Application life is dependent upon ambient environmental conditions. Increases in temperature and low humidity will shorten application time. Conversely, lower temperatures and high humidity will increase application life. For the examples, the life of the mixed sealant is approximately 2 hours, at 77 deg.F (25.00 deg.C) and 50 percent RH.
   (2) Prepare the sealant. Method 2: Prepare the sealant (Material No.V08-024)
     (a) Use sealant (Material No.V08-024) . Measure 75 parts of base compound and 10 parts of curing compound (accelerator).
     (b) Mix the two parts together until the paste has a constant quality. No streaks are permitted.
NOTE: When mixed the life of the sealant is approximately half an hour at 77 deg.F (25.00 deg.C).
NOTE: Sealant cure time is with relative humidity of 50 percent.
   (3) Apply the sealant:
CAUTION: DO NOT PUT THE SEALANT INTO THE WATER DRAINAGE SLOTS.
     (a) Put the sealant into the slots between the acoustic linings with a KNIFE - PUTTY.
     (b) When the sealant starts to feel hard, remove all unwanted sealant.
   (4) Cure the sealant. Method 1: Use the sealant (Material No.V08-154A)
     (a) Allow the sealant (Material No.V08-154A) to cure for 9 hours at ambient temperature 77 deg.F (25.00 deg.C) to 95 deg.F (35.00 deg.C).
     (b) Cure may be hastened by applying heat. The sealant (Material No.V08-154A) can obtain a serviceable cure hardness after four hours at 113 deg.F (45.00 deg.C).
     (c) If the remaining sealant material after repair exceeds the limit, dress the sealant material with the waterproof silicon carbide (Material No.V05-020) or equivalent, if necessary.
NOTE: Make sure that you monitor the ambient temperature of the sealant and work area with suitable instruments, across all of the lining.
NOTE: Make sure the full cure time is used and correct temperature maintained.
NOTE: If the bonding process passes 48 hours though is a condition of any humidity if the curing temperature is secured 50 deg.F (10.00 deg.C) or more, necessary strength is secured.
   (5) Curing of the sealant. Method 2: Use the sealant (Material No.V08-024)
CAUTION: THE MAXIMUM TEMPERATURE WHICH CAN BE USED TO CURE THE SEALANT IS 120 DEG.F (49 DEG.C)
     (a) Let the sealant cure for 10 hours at 77 deg.F (25.00 deg.C) or heat to 113 deg.F (45.00 deg.C) for approximately 1.5 hours.
NOTE: The minimum cure time is 1.5 hours. Sealant cure time is with relative humidity of 50 percent.
     (b) If the remaining sealant material after repair exceeds the limit, dress the sealant material with the waterproof silicon carbide (Material No.V05-020) or equivalent, if necessary.
Subtask 72-32-85-210-088-A ** ON A/C NOT FOR ALL
K. Examine the Repaired Area
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
F Repair of the Acoustic Linings ** ON A/C NOT FOR ALL
   (1) Make sure that the filler surface is smooth and flat.
   (2) Accept a step if it is less than 0.020 in. (0.5 mm).
   (3) If necessary, apply more filler and/or sealant.
   (4) Press or tap the linings to do a check for lack of bond.
   (5) If lack of bond is apparent, do this TASK again.
   (6) Make sure that the drain channels are not blocked.
Subtask 72-32-85-350-104-A ** ON A/C NOT FOR ALL
L. Identify the Repair
   (1) A log book entry is necessary when you have completed this repair. Write "VRS1845" in the engine log book.
   (2) At the next shop visit make a mark "VRS1845" adjacent to the part number. Use vibro-engraving equipment.
5. Close-up
Subtask 72-32-85-410-077-A ** ON A/C NOT FOR ALL
A. Close Access
   (1) Install the FEGVs (Ref. AMM TASK 72-32-88-400-010).
   (2) Install the LP compressor blades and fillers (Ref. AMM TASK 72-31-00-400-010) or (Ref. AMM TASK 72-31-11-400-010).
Subtask 72-32-85-942-074-A ** ON A/C NOT FOR ALL
B. Remove the Ground Support Equipment
   (1) Make sure that the work area is clean and clear of tools and other items.
   (2) Remove the access platform(s).
   (3) Remove the WARNING NOTICE(S).
[Rev.10 from 2021] 2026.04.01 13:01:06 UTC
"Aviabrain" 2025